Aiding the Self‐Assembly of Supramolecular Polyoxometalates under Hydrothermal Conditions To Give Precursors of Complex Functional Oxides

Sanchez, Maricruz Sanchez; Girgsdies, Frank; Jastak, Mateusz; Kube, Pierre; Schlögl, Robert; Trunschke, Annette

doi:10.1002/anie.201200746

Cited by 40 publications

(35 citation statements)

References 44 publications

(16 reference statements)

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“…The {Mo 132 }‐type capsules can even be used for the synthesis of metal oxides, for example, Mo‐V‐Sb30 (Figure 2) and Mo‐V‐Te29a oxides, thereby also demonstrating the transferability of pentagonal {(Mo VI )Mo VI 5 }‐type units as well as their role in the controlled syntheses of complex multielement oxide phases, which are of great importance as catalysts for the selective oxidation of light alkanes 53a. It should be noted that the smaller Keplerates with mononuclear linkers43, 44a act similarly as they exhibit the same pentagonal units 53b. 54…”

Section: Unique Structural Features and Deliberate Synthesis Based Onmentioning

confidence: 85%

Capsules with Highly Active Pores and Interiors: Versatile Platforms at the Nanoscale

Müller

Gouzerh

2014

Chemistry A European J

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Spherical porous capsules offer new exciting approaches in chemistry, materials sciences, and in context of physical and biological phenomena. The underlying concepts are reported with particular emphasis on metal oxide based capsules of the {M132 } Keplerate type which display-due to their exceptional structural features and easy variation/derivatization as well as exchange of building units-an unmatched range of properties and offer unique opportunities for investigating a variety of basic aspects of nanoscience, including the discovery of some new phenomena, especially those related to hydrophobicity issues that are of significance for everyday life. This relies in particular on the existence of a large number of flexible crown ether type pores/channels and the possibility of changing the interior from completely hydrophilic to completely hydrophobic due to the presence of numerous easily exchangeable internal ligands/functionalities; the capsules can even be constructed so that they enclose a large number of highly active Lewis and Brønsted acid sites. The manifold of possible applications/uses are outlined as subtitles with reference to results as well as possible future studies. There are, among many others, options to control passing cations under different internal frames allowing also their separations, to conduct studies about hydrophobic recognitions and clustering of biological interest in water, controlled internal ion transport, nanoscale dewetting, and to carry out basic as well as new types of reactions under confined conditions.

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Section: Unique Structural Features and Deliberate Synthesis Based Onmentioning

confidence: 85%

Capsules with Highly Active Pores and Interiors: Versatile Platforms at the Nanoscale

Müller

Gouzerh

2014

Chemistry A European J

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“…Spectroscopic and analytical studies of inorganic syntheses are particularly important to understand the mechanisms behind the complex reactions under hydrothermal conditions and to rationally design experiments for the synthesis of new phases exhibiting designated properties 1d,2. We have developed an analytical autoclave (Figure 1) that enables the synthesis of comparatively large batches of oxides according to a new concept that implies a guided synthesis based on spectroscopic information obtained online during the entire experiment 3. The synthesis is performed automated according to a pre‐assigned sequence of reaction steps and the reaction parameters, such as temperature, pressure, power intake of the stirrer, and pH are measured and recorded.…”

Section: Introductionmentioning

confidence: 99%

Speciation of Molybdates under Hydrothermal Conditions

Noack

Rosowski

Schlögl

et al. 2014

Zeitschrift anorg allge chemie

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4-is the final molecular precursor of precipitation reactions that was detectable by Raman spectroscopy. The structural type of the solid phase formed through addition of vanadyl sulfate under hydrothermal conditions is sensitively controlled by the nature of the molecular precursor, which is adjusted by the pH. In acidic medium, hex. MoO 3 (ICSD 80290) is formed, while at pH=5.8 nano-crystalline M1 (ICSD 55096) was obtained.

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“…In agreement with the XRD results, after the propene reaction the Raman spectrum kept the general features of M1 but lost distinct bands at $\tilde \nu $ =875 (MO stretching) and 450 cm −1 . These two Raman bands were identified as indicators of the high crystallinity of the M1 phase, as the bands occurred upon annealing nanocrystalline M1 into microcrystalline M1 at elevated temperatures 23. Besides, no sign of coke deposition24 at $\tilde \nu $ =1300–1800 cm −1 was observed in the Raman analysis.…”

Section: Methodsmentioning

confidence: 99%

The M1 Phase of MoVTeNbO as a Catalyst for Olefin Metathesis and Isomerization

et al. 2014

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Polycrystalline MoVTeNb oxide composed of the M1 phase was studied in the transformation of propene at reaction temperatures between 323 and 573 K in the absence of oxygen and water. Surprisingly, the catalyst showed considerable activity in propene metathesis to ethene and 2-butenes, which was attributed to partial reduction of the catalyst surface under the reaction conditions. The multifunctionality of the M1 phase, which is known as a selective catalyst for the direct oxidation of propane to acrylic acid, was furthermore reflected in the formation of 1-butene and isobutene owing to C4 isomerization. This study demonstrates the diversity of the M1 phase as a catalyst, which is based on surface dynamics and structural stability, and further improves the understanding of the complex reaction network of short-chain hydrocarbons over MoVTeNbO M1 catalysts

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Aiding the Self‐Assembly of Supramolecular Polyoxometalates under Hydrothermal Conditions To Give Precursors of Complex Functional Oxides

Cited by 40 publications

References 44 publications

Capsules with Highly Active Pores and Interiors: Versatile Platforms at the Nanoscale

Capsules with Highly Active Pores and Interiors: Versatile Platforms at the Nanoscale

Speciation of Molybdates under Hydrothermal Conditions

The M1 Phase of MoVTeNbO as a Catalyst for Olefin Metathesis and Isomerization

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